Ballast Water Exchange & Treatment Planning Tool

BWM Convention • D-1 95% Exchange • 3× Pump-Through • 200 nm / 200 m • D-2 Treatment • BWMS Throughput • Tank Plan • Hold Time

Ballast Water Exchange & Treatment Planning Tool

Build a tank-by-tank ballast-water plan without mixing up D-1 exchange volume with D-2 treatment throughput. Simple mode estimates exchange or treatment time and checks the D-1 location criteria. Advanced combines D-1 pumping-through, D-1 sequential exchange and D-2 treatment in one tank register, then screens ballast-pump capacity, BWMS treatment capacity, operating envelope, hold time and voyage execution.

↑

Need multiple tanks, BWMS derating or mixed D-1/D-2 methods? Click Advanced above.The graphs on the right are deliberately stacked full-width so labels remain readable.

D-1 exchange95% / 3× volume screen

D-2 treatmentBWMS throughput & time

VoyageExchange-area screen

Management Method

Planning method

Ballast / tank volume basism³.

Available ballast pump capacitym³/h.

D-1 pumping-through multiplier× tank volume. Three times is deemed to meet D-1.

Sequential residual after pump-out% of tank volume remaining before refill.

BWMS treatment capacitym³/h rated/effective capacity.

Exchange Area

Distance from nearest landnautical miles.

Water depthm.

Designated / approved exchange area?

Voyage / Exchange Area

Distance from nearest landnm.

Water depthm.

Designated / approved exchange area?

D-1 pumping-through multiplier

Sequential residual after pump-out% of tank capacity.

Available ballast pump capacityCombined m³/h for the planned operation.

BWMS Operating Basis

Current water temperature°C.

Approved minimum temperature

Approved maximum temperature

Current salinityPSU / practical salinity basis.

Approved minimum salinity

Approved maximum salinity

Required minimum hold timeh. Enter 0 if not applicable to the approved BWMS.

Hold time available before dischargeh.

BWMS Unit Register

TRC/nameplate capacity and operational derating are vessel/system specific. Derating can represent fouling, filter limitations, lamp condition, electrolysis limits or other approved operating-envelope restrictions.

Use	Technology	Rated capacity m³/h	Available now?	Operational derate %	Power kW

Ballast Tank Plan Register

For D-1 pumping-through, volume basis is tank capacity and 3× capacity is the convention’s deemed-compliance benchmark. Sequential exchange uses the entered residual percentage. D-2 treatment uses the actual ballast volume to be treated.

Use	Tank capacity m³	Ballast onboard m³	Plan method

Ballast Water Management Checks

Approved BWMP checkedTank sequence and management method match the ship-specific Ballast Water Management Plan. Stability / strength sequence checkedExchange sequence is acceptable for trim, stability, sloshing and longitudinal strength. Exchange-area basis verifiedDistance, depth and any designated area are confirmed for the actual voyage. BWMS type approval / operating limits checkedWater quality, temperature, salinity and treatment conditions are within approved limits. BWMS capacity / pump alignment verifiedBallast pump flow cannot overload the treatment system. Required hold time verifiedAny approved holding/neutralization requirement can be satisfied before discharge. Contingency / bypass procedure reviewedFailure response follows the approved BWMP and relevant port/flag requirements. Ballast Water Record Book plan readyTank, volume, location, times and management method will be recorded.

Regulatory / operational boundary: D-2 compliance is a biological discharge-performance standard and cannot be proven from flow rate or treatment time alone. This tool plans the hydraulic/operational side of a type-approved BWMS. Actual compliance depends on the approved system being operated within its certification and operating limits, required records, maintenance and any applicable sampling/port-State requirements.

BWM Convention basis: D-1 requires 95% volumetric exchange. Pumping through three times a ballast tank’s volume is considered to meet D-1; less than three times may be accepted when at least 95% exchange can be demonstrated. Exchange should, whenever possible, be at least 200 nm from nearest land in water at least 200 m deep; where that cannot be met, it should be as far from land as possible and at least 50 nm from land in water at least 200 m deep, or in a designated area where applicable. D-2 controls viable-organism and indicator-microbe concentrations in discharged ballast water.

Generated by ShipUniverse.com

By the ShipUniverse Editorial Team — About Us | Contact